Furnace



June 7, 1938. R. M. HARDGROVE ET AL 2,120,129

FURNACE Filed June 24, 1956 2 Sheets-Sheet 1 LL- 6 INVENTORS P ussel L. Godshczlk Ra lph M Hardgro ve, Lwzs Heller f Po/fia Shellenberger ATTORNEY.

June 11938; M. HARDGRQVE ETAL 1 0 129- FURNACE File'd June 24, 1936 2 Sheets-Sheet 2. F 15 7 June Z %33 TEE marsh greens as "i FFWE FURNACE Appiication June 24,1936, Serial a... 36,896 it Claims. (or. 122-5) This invention relates to furnaces, and, more particularly, to furnaces which include fluid cooled walls.

an object of the invention is to provide a fur g nace wall with a row of fluid cooled tubes having extended surface members so associated with bonding elements that the tubes are maintained in alignment and insulating material is maintained thereby exteriorly of the tubes so as to prevent heat losses and maintain the wall elements in their bonded relationships.

Another object of the invention is to minimize dimculties which have been experienced in placing the wall insulating material and the outer i5 casing in their operable positions with respect to the inner part of the wall which includes the fluid cooled tubes. .By the present invention, bonding members may be placed in p'osition with the insulating material and interlocked with cooper- 9 ating bonding members secured to extended suri'ace elements on the tubes in such a way as to increase the maximum tolerances in the posi-' tioning of the cooperating bonding members on the extended surface elements and the wall casing, respectively. s

Qther objects of the invention will appear as the accompanying description proceeds.

The invention will be described with reference to the particular'embodiments shown in the ac- 39 companying drawings, in which:

Fig. 1 is a transverse section of the furnace wall indicated in Fig. 2 of the drawings.

Fig.2 is a longitudinal section of the Fig. 1 wail, taken on the line of 2-2 of Fig. 1. as t Fig. 3 is a transverse section of the wall indicated in Fig. 4. t Fig. 4 is the longitudinal section of Fig. 3 wall,

taken on section line 4-1 of Fig. 3.

Fig. 5 is the transverse section of. the embodido inent of the invention indicated in Fig. {S of the drawings.

Fig. 6 is the longitudinal section taken on the sectionline 6-45 of Fig. 5.

Fig. '7 is the transverse section of the Fig. 8 45 wall. f

Fig. 8 is the longitudinal section taken on line 8-8 of Fig. 7.

Fig. 9 is a transverse section of the embodiment 50 of the invention indicated in Fig. 10 of the drawings.

Fig. 10 is a longitudinal section taken on the line iii-i0 of Fig. 9. I

Fig. 11 is a transverse section of an additional 56 embodiment oi 'the invention.-

Fig. 12 is a longitudinal section taken on the section line i2-l2 of Fig. 11.

Fig. 13 is a transverse, or horizontal, section of an embodiment of the invention in which the extended surface elements of the tubes afi'ord parts a of the tension means which bond the inner, or tube wall, to the casing and the insulating mate- I rial.

Fig. 14 is a longitudinal, or vertical, section taken on the line ifiil of Fig. 13. I m

. Fig. 15 is a transverse section of a wall in which parts of the bonding means are provided by members which also tie together adjacent extended surface elements projecting toward positions midway of adjacent wall tubes.

Fig. 16 is a longitudinal, or vertical, section taken on the line 'iE-iB of Fig. 15.

fluid circulation system and, on their sides presented toward the burning fuel of the furnace, they are provided with extended surface elements in the form of the transverse metal plates II. The plates are preferably welded to the tubes and they are so formed that they extend into the inter-tube spaces. That is,-the plates extending from the facing sides of adjacent tubes extend towards each other. Their adjacent ends are, however, preferably slightly spaced.

At positions preferably midway between ad jacent tubes, the ends of plates 12 are received in the slots formed in the inner ends of the tie bolts i l. in order that the wall tubes may be maintained in their wall'all'gnment, each tie bolt 40 is preferably welded to the tube plates contacted by it. i

The tie bolts :4 extend through saddle blocks l6 and then through appropriately spaced openings in. a plate l8. short structural steelsections 2|) which are shown secured to the channel 22, whichis' a part of the supporting steel-work. Some of the tie bolts extend through the flanges 0f the sections 20, as indicated at 2, and it will be clear that the inner wall is tightly held in place when the'tie bolts are tightened.

The outer flanges 26 of the sections 20 are held against the buckstay channel 22 by the clips 28, 55

This plate is held against and this channel may be reinforced by such an I-beam as that shown in Fig. 6. at 38.

Between the channel plate 22 and the plate I8, there is located insulating material 32. This material may be in the form of blocks and, between its inner surface and plate I8, a loose insulating layer 34 may be located. The wall is completed, by refractory material 36 of high heat resisting capacity, installed as a plastic over the plates I2 and the tubes I8.

When the adjacent tubes I8 of the furnace wall are tied together by bars 38 positioned between the plates I2 of adjacent tubes and welded thereto, a construction is presented like that shown in Figs. 5 and 6. In Fig. 6 a section of thebar 38 is indicated as extending between two adjacent tie bolts 48 and 2. They also may be welded thereto. It will be noted that, in the Fig. 6 construction, the structural steel section 44 extends transversely relative to the tubes 86, so that the tie bolts 48 and 42, secured to oppositely extending flanges 41 and 48 of that section, will be spaced longitudinally of the tubes. Also in the modification indicated in Figs. 5 and 6, the tubes 46 may rest directly against the section 44. 4 Y

Figs. 3 and 4 show a modification of the invention wherein the tubes are bonded to the casing 58 at positions between adjacent buckstays. this modification the inner wall is provided with tubes 52 and the extended surface plates 54 are arranged in the same manner as they are in Fig. 1.

the wall. In thisconstruction, however, the tie bolts 58 and their inner ends 59, bend at right angles as shown in Fig. 4. These inner ends thus extend longitudinally'ofthe tubes so thatthey contact with a plurality of the plates 54 extending from each tube. The tie bolts are preferably welded to all of the contacting plates, and the bolts contact with a plurality of plates extending from each of two adjacent tubes, the tubes and plates being thereby held in alignment. The bolts extend through insulating layers 68 and 82, similar to those described with reference to the modifications shown in Fig. 1.

In all of the remaining embodiments the arrangement of the inner wall including the tubes, the extended surface plates, and the refractory forming the fire face of the wall is thesame as that described with reference to the preceding embodiments. Figs. 7 and 8 illustrate the plates 66 and 68 as secured to thebuckstay channel I8 by U-shaped clips I2 and 14. Each clip is "preferablywelded to adjacent plates extending to- I wards each other from adjacent tubes as shown;

7 86 and 88 to the tubes. 0

and the clips are bolted to the H-beam sections 16. which, in turn, may be rigidly securedto the channel 18 in any desired manner. s

The embodiment shown in Figs. '9 and 10 includes an L-shaped bolt 18 extending through the casing 88 and having its inner end 82 bent at right angles andfextending-down through a clip 84. The clip. 84 is similar to the-corresponding element indicated in Figs. '7 and 8, but it is so formed as to give greater-latitude inconnect ing the casing88 and the interposed'insulation of this type,,this particular arrangement of elements is, advantageous. because it does not:de mand an exact alignment between the casing openingsfor the elements I8 and the cooperatingface plates I the -L-shaped bolts The inner wall also includes a similar refractory material 55 forming the fire face of".

In erecting a furnace wall The modification indicated in Figs. 11 and 12 includes an H-beam section 92 which contacts with the tubes 94 as shown. The extended surface plates 86 are secured to the elements 82 by bolts 98, the heads of which are welded to the plates, as shown.

In the modification shown in Figs. 13 and 14, I88 extend downwardly through openings formed in some of the extended surface plates I82. These plates are shaped somewhat differently from the plates I84, andhave' portions extended toward the casing I86.

The modification shown in Figs. 15' and 16 of the drawings include plates I88 which overlap-the stud plates I I8 and H2 extending toward each other from the tubes Ill and H6. Each of theseplates I88 is provided with an-opening through which extends the downwardly projected end I II of the casing bolt I28.

It is to be understood that the tie bolts, or tension members shown in Figs. 5-17 inclusive,

'may be employed for each pair of wall tubes.

Some may be arranged so that the tubes of each pair ,of successive wall tubes have a tie bolt between them, or, in the event that the stud extensions from' adjacent tubes are otherwise bonded, the tie bolts may. be arranged with a greater spacing. Such clips as those shown in Fig. 1 may also be employed in the constructions indicated in Figs. 5, '7, andll. v

In theFig: l7 embodiment the tie rod 51 is a straight extension boltwelded to the nearest stud plate or to a'pair of the plates 53 extending from adjoining tubes 5|. Such a weld is indicated at 59. v I

Whereas the invention has been described with reference to the detail structures of a few modifications it is to be appreciated that it may not be considered as limited thereto. It is rather of a scope commensurate with the scope of the subjoined claims. I

We claim:

1. In a furnace wall adapted for use as a part of a steam boiler or other fluid heat exchange apparatus, an inner wall construction including spaced wall tubes having. transverse extended surface elements welded thereto, an outer metallic structure, ceramic refractory material presenting a furnace face and positioned between the tubes and also between the elements, heat insulation material between the outer structure and secured to a plurality of extended surface elements onadjacent tubes and extending through said insulation material for bonding the wall elements together.

2. In a furnace wall, spaced wall tubes having transversev metal plates welded thereto, ceramic refractory material bonded by the plates and positioned between them so as to present a furthe inner wall, and transverse tension means each nace face, ametallic casing, heat insulation material between the casing and the tubes, metallic bonding members in the form of transverse tension elements each of which is secured to a plurality of the plates extending from adjacent tubes, and refractory material installed as a plastic over the tubes and the plates to'form the fire face of the wall. I r -3. In a.furnace, spaced wall tubes, transverse metal plates welded to the tubes, ceramic refractory material between the tubes and also between the plates, an outer metal structure, heat insulation material between the tubes and said structure, and metallic tension means each secured to separate plates extending toward each other from adjacent tubes and engaging said structure to bind the tubes and said structure against the insulating material, said means including inter-engaging elements capable of relative movement without detracting from the bonded condition of the wall.

4. In a furnace wall adapted for use as a part of a'steam boiler or other fluid heat exchange apparatus, an inner wall construction including spaced wall tubes having transverse metal plates welded thereto, ceramic refractory material be- .tween the plates and forming a furnace face, an

tween the plates'and forming a furnace face, a

metallic outer structure, heat insulation material between said structure and the inner wall, and transverse tension means each secured to plates extending from adjacent tubes and each extending'through said insulation material for bonding the wall elements together.

6. In a furnace wall adapted for use as a part a of a steam boiler or other fluid heat exchange apparatus, an inner wall-construction including spaced wall tubes having transverse metal plates welded thereto, ceramic refractory materialbetween the plates and forming a furnace face, a metallic outer structure, 'heat insulation material between said outer structure and the inner wall,

I and tension bolts each having slot and pin connections with the plates extending from adjacent tubes, said bolts extending through said insulation material for bonding the wall elements together.

7, In a furnace wall, spaced walltubes having transverse extended surface elements welded thereto, ceramic refractory material presenting, a furnace face and positioned between the tubes and also between the elements, a metallic casing,'

heat insulation material between the casing and the tubes, metallic tension members each of which is connected to a plurality of said elements extending from adjacent tubes, and refractory material installed as a plastic over the tubes and said elements to form the fire face of the wall.

8. In a furnace, spaced wall tubes,- transverse extended surface elements welded to the tubes, ceramic refractory material presenting a furnace face and positioned between the tubes and also between the elements, an outer metal structure, heat insulation material between the tubes and said structure, and metallic tension means each connected to separate elements extending toward each other from adjacent tubes and engaging said structure to bind the tubes and said structure against the insulation material.

9. In a furnace wall, spaced wall tubes having transverse extended surface elements welded thereto, ceramic refractory material presenting a furnace face and positioned between the tubes and also between the elements, an outer metallic structure, heatinsulation material between the outer structure and the tubes, metallic bonding members each of which is secured to a plurality of said elements extending from adjacent tubes, and refractory material installed as a plastic over the tubes and said elements to form the fire face of the wall, said bonding members extending through the insulation material to press the tubes.

connected to surface elements extending toward each other from adjacent tubes and engaging said structure to bind the tubes and said structure against the insulation material, said means including inter-engaging clips and bolts capable of relative movement without detracting from the [bonded condition of the wall.

RALPH M. HARDGROVE. ROLFE SHELLENBERGER. LEWIS W-HELLER. RUSSELL L. GODSHALK. 

